501
The device provides the following priority trust modes on a port:
• Trust packet priority—The device assigns to the packet the priority parameters corresponding to the
packet’s priority from the mapping table.
• Trust port priority—The device assigns a priority to a packet by mapping the priority of the
receiving port.
You can select one priority trust mode as needed. Figure 481 sh
ows the process of priority mapping on
a device.
Figure 481 Priority mapping process
Introduction to priority mapping tables
The device provides the following types of priority mapping tables:
• CoS to DSCP—802.1p--to-DSCP mapping table.
• CoS to Queue—802.1p--to-local mapping table.
• DSCP to CoS—DSCP-to-802.1p mapping table, which applies to only IP packets.
• DSCP to DSCP—DSCP-to-DSCP mapping table, which applies to only IP packets.
• DSCP to Queue—DSCP-to-local mapping table, which applies to only IP packets.
Table 142 thr
ough Table 143 list the default priority mapping tables.
Table 142 The default CoS to DSCP/CoS to Queue mapping table
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